Resources Contact Us Home
Browse by Category: Main > Information Technology
Class Information
Number: 33/491
Name: Geometrical instruments > Straightedge type > Rules > With attachment > Selectable
Description: Subject matter wherein the straightedge is constructed to provide a choice of ruling edges.

Patents under this class:

Patent Number Title Of Patent Date Issued
8438744 Ruler and method of use May. 14, 2013
7415772 Rainbow ruler Aug. 26, 2008
6813841 Measuring device for teaching incremental measurements Nov. 9, 2004
6816805 Computer generated scale and conversion instrument Nov. 9, 2004
6243959 Measuring and instructional ruler Jun. 12, 2001
5881469 Measuring and instructional ruler Mar. 16, 1999
5822875 Scanning electron microscopic ruler and method Oct. 20, 1998
5479719 Rolling ruler Jan. 2, 1996
4839833 Programmable display engineering scale Jun. 13, 1989
4707928 Vari-scale Nov. 24, 1987

  Recently Added Patents
Electronic circuit having shared leakage current reduction circuits
Semiconductor devices having multi-width isolation layer structures
Noise suppression in speech signals
Calibration device and related method for phase difference between data and clock
Optical cable plug-in detection
(Meth)acrylic resin composition, imidized (meth)acrylic resin composition, and film obtained by molding them
Compression molding method and reinforced thermoplastic parts molded thereby
  Randomly Featured Patents
Apparatus and method for the optical imaging of tissue samples
Apparatus for projecting a reduced image of a photomask using a schwarzschild objective
Bottle cap
Cable cutter
Plants having an enhanced resistance to necrotrophic pathogens and method of making same
Preparation of substituted and unsubstituted 2-carbamoyl nicotinic and 3-quinolinecarboxylic acids
Fuel injection system
Magnet rack that can be easily removed from a magnetically attractive surface
Dental articulator